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Blowing big bubbles.

Christopher A E Hamlett1, Dolachai N Boniface2, Anniina Salonen2

  • 1Nottingham Trent University, Nottingham, NG11 8NS, UK. david.fairhurst@ntu.ac.uk.

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Researchers generated giant bubbles up to ten times larger than the wand by blowing gently downwards. Different surfactants were tested, with Fairy liquid producing more stable, larger bubbles than sodium dodecyl sulfate (SDS).

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Area of Science:

  • Fluid dynamics
  • Surface science

Background:

  • Street artists create large bubbles, but size is limited by wand diameter.
  • Understanding bubble formation dynamics can lead to novel applications.

Purpose of the Study:

  • To explore a new regime for generating significantly larger bubbles.
  • To investigate the influence of airflow and surfactants on bubble size and stability.

Main Methods:

  • Gently blowing downwards to generate bubbles.
  • Comparing bubble formation using Fairy liquid and sodium dodecyl sulfate (SDS) solutions.
  • Observing bubble size relative to wand diameter and stability.

Main Results:

  • Generated bubbles with radii up to ten times larger than the wand.
  • Observed largest bubble formation at lowest air speeds, similar to dripping mode.
  • Fairy liquid produced stable bubbles, while SDS bubbles burst prematurely.

Conclusions:

  • Gentle downward blowing enables the creation of exceptionally large bubbles.
  • Surfactant choice significantly impacts bubble stability, with commercial detergents outperforming SDS in this context.